Yeah. That was it. SW101 question: Why is this needed? VS2010 can't compile to not need the runtime? I don't remember needing this for any ax file I've used. Though it could be I already had the dependency needed...

Pretty much no compiler compiles to not need a runtime (typically this is only done for things like compiling kernels), that would make a ton of compatibility issues. VS2010 is pretty new to find in public releases, so it's not unlikely that you'd never needed it before.